Date: Tue, 21 Dec 1999 10:32:19 -0800 (PST) From: Steven Kehlet <kehlet@techfuel.com> To: freebsd-questions@freebsd.org Subject: weird hangs: networking hosed (except for ping), can switch consoles but can't type Message-ID: <Pine.LNX.4.10.9912211031510.560-200000@phoenix.techfuel.com>
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[-- Attachment #1 --]
Hi :-),
I'm using a FreeBSD 3.3 box at work as a mail/web/login server. It serves
about 30-40 people (mostly Windows users getting mail) but never really
pushes much of a load.
However recently, it's been having weird hangs about once every week
to two weeks. All the sudden all network services appear to be hosed.
You can ping the box. You can telnet to it, at which point the connect
succeeds, but the banner and login prompt never appear. Mail and web
services behave similarly--you can connect to the port but the service
doesn't respond. You step over to the console, and you can Alt-F? to
switch consoles. However nothing else you type gets registered.
I know this is bizarre and a total shot in the dark but I was hoping
anyone might have some suggestions as to what the problem might be. I
don't think it's some kind of packet attack since the box is behind a
well-configured firewall (unless, of course, it's somebody inside).
Here's some information about the box:
FreeBSD basilisk.techfuel.com 3.3-RELEASE FreeBSD 3.3-RELEASE #1: Thu Dec 2 14:37:16 PST 1999 kehlet@basilisk.techfuel.com:/usr/src/sys/compile/BASILISK i386
I have maxusers set to 256 and NMBCLUSTERS=2048. I don't think this is
the problem, though.
basilisk:~-> uptime
9:45AM up 5 days, 21:45, 7 users, load averages: 0.22, 0.05, 0.02
basilisk:~-> netstat -m
190/1376 mbufs in use:
129 mbufs allocated to data
61 mbufs allocated to packet headers
128/496/2048 mbuf clusters in use (current/peak/max)
1164 Kbytes allocated to network (24% in use)
0 requests for memory denied
0 requests for memory delayed
0 calls to protocol drain routines
I have SOFTUPDATES enabled. It's also running a lot of other services
like Zope, MySQL, NOCOL, Samba, nfsd, amd, but I wouldn't think any of
these (except maybe Zope) could manage to hose the machine.
Thanks in advance! Any suggestions are appreciated. My kernel config
file is attached.
Steve
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#
# BASILISK
#
machine "i386"
#cpu "I386_CPU"
#cpu "I486_CPU"
#cpu "I586_CPU"
cpu "I686_CPU"
ident BASILISK
maxusers 256
#options MATH_EMULATE #Support for x87 emulation
options INET #InterNETworking
options FFS #Berkeley Fast Filesystem
options FFS_ROOT #FFS usable as root device [keep this!]
options MFS #Memory Filesystem
options MFS_ROOT #MFS usable as root device, "MFS" req'ed
#options NFS #Network Filesystem
#options NFS_ROOT #NFS usable as root device, "NFS" req'ed
#options MSDOSFS #MSDOS Filesystem
#options "CD9660" #ISO 9660 Filesystem
#options "CD9660_ROOT" #CD-ROM usable as root. "CD9660" req'ed
#options PROCFS #Process filesystem
options "COMPAT_43" #Compatible with BSD 4.3 [KEEP THIS!]
options SCSI_DELAY=15000 #Be pessimistic about Joe SCSI device
options UCONSOLE #Allow users to grab the console
#options FAILSAFE #Be conservative
options USERCONFIG #boot -c editor
options VISUAL_USERCONFIG #visual boot -c editor
options INCLUDE_CONFIG_FILE # Include this file in kernel
options "NO_F00F_HACK"
#options USER_LDT #allow user-level control of i386 ldt
#options IPFIREWALL #firewall
#options IPFIREWALL_VERBOSE #print information about
# dropped packets
#options IPFIREWALL_FORWARD #enable transparent proxy support
##options "IPFIREWALL_VERBOSE_LIMIT=100" #limit verbosity
#options IPFIREWALL_DEFAULT_TO_ACCEPT #allow everything by default
options SOFTUPDATES
#options "P1003_1B"
#options "_KPOSIX_PRIORITY_SCHEDULING"
#options "_KPOSIX_VERSION=199309L"
options SC_DISABLE_REBOOT # disable reboot key sequence
options IDE_DELAY=8000 # Be optimistic about Joe IDE device
options NMBCLUSTERS=2048
config kernel root on wd0
# To make an SMP kernel, the next two are needed
#options SMP # Symmetric MultiProcessor Kernel
#options APIC_IO # Symmetric (APIC) I/O
# Optionally these may need tweaked, (defaults shown):
#options NCPU=2 # number of CPUs
#options NBUS=4 # number of busses
#options NAPIC=1 # number of IO APICs
#options NINTR=24 # number of INTs
controller isa0
#controller pnp0
#controller eisa0
controller pci0
controller fdc0 at isa? port "IO_FD1" bio irq 6 drq 2
disk fd0 at fdc0 drive 0
disk fd1 at fdc0 drive 1
#options "CMD640" # work around CMD640 chip deficiency
controller wdc0 at isa? port "IO_WD1" bio irq 14 flags 0xa0ffa0ff
disk wd0 at wdc0 drive 0
disk wd1 at wdc0 drive 1
controller wdc1 at isa? port "IO_WD2" bio irq 15 flags 0xa0ffa0ff
disk wd2 at wdc1 drive 0
disk wd3 at wdc1 drive 1
options ATAPI #Enable ATAPI support for IDE bus
options ATAPI_STATIC #Don't do it as an LKM
device acd0 #IDE CD-ROM
#device wfd0 #IDE Floppy (e.g. LS-120)
# A single entry for any of these controllers (ncr, ahb, ahc) is
# sufficient for any number of installed devices.
#controller ncr0
#controller ahb0
#controller ahc0
#controller isp0
#
## This controller offers a number of configuration options, too many to
## document here - see the LINT file in this directory and look up the
## dpt0 entry there for much fuller documentation on this.
#controller dpt0
#
#controller adv0 at isa? port ? cam irq ?
#controller adw0
#controller bt0 at isa? port ? cam irq ?
#controller aha0 at isa? port ? cam irq ?
#
#controller scbus0
#
#device da0
#
#device sa0
#
#device pass0
#
#device cd0 #Only need one of these, the code dynamically grows
#
#device wt0 at isa? port 0x300 bio irq 5 drq 1
#device mcd0 at isa? port 0x300 bio irq 10
#
#controller matcd0 at isa? port 0x230 bio
#
#device scd0 at isa? port 0x230 bio
# atkbdc0 controlls both the keyboard and the PS/2 mouse
controller atkbdc0 at isa? port IO_KBD tty
device atkbd0 at isa? tty irq 1
device psm0 at isa? tty irq 12
device vga0 at isa? port ? conflicts
# splash screen/screen saver
#pseudo-device splash
# syscons is the default console driver, resembling an SCO console
device sc0 at isa? tty
# Enable this and PCVT_FREEBSD for pcvt vt220 compatible console driver
#device vt0 at isa? tty
#options XSERVER # support for X server
#options FAT_CURSOR # start with block cursor
# If you have a ThinkPAD, uncomment this along with the rest of the PCVT lines
#options PCVT_SCANSET=2 # IBM keyboards are non-std
device npx0 at isa? port IO_NPX irq 13
#
# Laptop support (see LINT for more options)
#
#device apm0 at isa? disable flags 0x31 # Advanced Power Management
# PCCARD (PCMCIA) support
#controller card0
#device pcic0 at card?
#device pcic1 at card?
device sio0 at isa? port "IO_COM1" flags 0x10 tty irq 4
device sio1 at isa? port "IO_COM2" tty irq 3
device sio2 at isa? port "IO_COM3" tty irq 5
device sio3 at isa? disable port "IO_COM4" tty irq 9
# Parallel port
device ppc0 at isa? port? flags 0x40 net irq 7
controller ppbus0
device lpt0 at ppbus?
device plip0 at ppbus?
device ppi0 at ppbus?
#controller vpo0 at ppbus?
#
# The following Ethernet NICs are all PCI devices.
#
#device ax0 # ASIX AX88140A
#device de0 # DEC/Intel DC21x4x (``Tulip'')
#device fxp0 # Intel EtherExpress PRO/100B (82557, 82558)
#device mx0 # Macronix 98713/98715/98725 (``PMAC'')
#device pn0 # Lite-On 82c168/82c169 (``PNIC'')
#device rl0 # RealTek 8129/8139
#device tl0 # Texas Instruments ThunderLAN
#device tx0 # SMC 9432TX (83c170 ``EPIC'')
#device vr0 # VIA Rhine, Rhine II
#device vx0 # 3Com 3c590, 3c595 (``Vortex'')
#device wb0 # Winbond W89C840F
device xl0 # 3Com 3c90x (``Boomerang'', ``Cyclone'')
# Order is important here due to intrusive probes, do *not* alphabetize
# this list of network interfaces until the probes have been fixed.
# Right now it appears that the ie0 must be probed before ep0. See
# revision 1.20 of this file.
#device ed0 at isa? port 0x280 net irq 10 iomem 0xd8000
#device ie0 at isa? port 0x300 net irq 10 iomem 0xd0000
#device ep0 at isa? port 0x300 net irq 10
#device ex0 at isa? port? net irq?
#device fe0 at isa? port 0x300 net irq ?
#device le0 at isa? port 0x300 net irq 5 iomem 0xd0000
#device lnc0 at isa? port 0x280 net irq 10 drq 0
#device ze0 at isa? port 0x300 net irq 10 iomem 0xd8000
#device zp0 at isa? port 0x300 net irq 10 iomem 0xd8000
#device cs0 at isa? port 0x300 net irq ?
pseudo-device loop
pseudo-device ether
pseudo-device sl 1
pseudo-device ppp 2
pseudo-device tun 1
pseudo-device pty 64
pseudo-device gzip # Exec gzipped a.out's
pseudo-device vn #Vnode driver (turns a file into a device)
# KTRACE enables the system-call tracing facility ktrace(2).
# This adds 4 KB bloat to your kernel, and slightly increases
# the costs of each syscall.
#options KTRACE #kernel tracing
# This provides support for System V shared memory and message queues.
#
options SYSVSHM
options SYSVMSG
options SYSVSEM
# The `bpfilter' pseudo-device enables the Berkeley Packet Filter. Be
# aware of the legal and administrative consequences of enabling this
# option. The number of devices determines the maximum number of
# simultaneous BPF clients programs runnable.
pseudo-device bpfilter 4 #Berkeley packet filter
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